docs: def __check_mapping(self, landmarks):
          """
          Checks whether the image, from which the supplied landmarks were extracted, can
          be transformed to the learned standard intensity space without loss of
          information.
          """
          sc_udiff = numpy.asarray(self.__sc_umaxs)[1:] - numpy.asarray(self.__sc_umins)[:-1]
          l_diff = numpy.asarray(landmarks)[1:] - numpy.asarray(landmarks)[:-1]
          return numpy.all(sc_udiff > numpy.asarray(l_diff))